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Engine Timing Chain Issues

  • Thread starter Thread starter Insain1
  • Start date Start date Aug 28, 2016

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#1
  • Aug 28, 2016
  • #1
Just had my heads rebuilt. Putting timing cover on and crankshaft tone ring sticks out to far. I ordered timing kit for 97 4.6 but the crankshaft gear is thicker than the factory. Also the engine is not the original one to the car. Was changed before I bought it. Any help would be appreciated
 

wmburns

SN Certified Technician
Aug 14, 2009
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Houston Texas
Aug 28, 2016
#2
  • Aug 28, 2016
  • #2
Pictures would be nice.

But are you aware that the Crank shaft timing Gear does have a shoulder and does have a correct orientation.

The trigger wheel also has a correct orientation.

Did you take picture before dis-assembly?

Should we assume this a 1997 GT? One of the questions/possibilities is that a different motor has been installed. IF this is a PI motor, we should expect problems if the timing set from a non-PI motor has been used. Again this is where pictures and head and block casting numbers could help.
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#3
  • Aug 28, 2016
  • #3
wmburns said:
Pictures would be nice.

But are you aware that the Crank shaft timing Gear does have a shoulder and does have a correct orientation.

The trigger wheel also has a correct orientation.

Did you take picture before dis-assembly?

Should we assume this a 1997 GT? One of the questions/possibilities is that a different motor has been installed. IF this is a PI motor, we should expect problems if the timing set from a non-PI motor has been used. Again this is where pictures and head and block casting numbers could help.
Click to expand...
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#4
  • Aug 28, 2016
  • #4
Don't know what PI and non-PI are. I'm a push rod guy just getting into the mod motors. The crankshaft gear is on correct. The only side with timing mark facing out. The crankshaft position tone ring is facing with the word "rear" facing rear. I'll try to get a picture of it to load up. Not quite figured this thing out.
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#5
  • Aug 28, 2016
  • #5
see the difference ?
 
G

Gkperformance

New Member
Aug 1, 2014
6
0
1
Aug 28, 2016
#6
  • Aug 28, 2016
  • #6
I see the difference and that sucks since you got it all together. Must be a year diff like you spoke about it maybe being a diff year engine. Other than using the old one or finding a timing cover that will clear, seam to be screwed. Maybe someone with more exp will chime in.
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 28, 2016
#7
  • Aug 28, 2016
  • #7
The 1999-2004 GT uses 4.6 SOHC PI heads. The intake ports are square'ish.

The 1996-1998 uses 4.6 SOHC non-PI heads. The intake ports are round tear drop shaped.

Since you just had the heads re-worked, you should know which type (PI or non-PI) that you have. Not really possible to put this motor back together correctly without knowing this information.

The new crank timing gear does not appear to be stock. Is it "adjustable"?
 
Last edited: Aug 29, 2016

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#8
  • Aug 28, 2016
  • #8
wmburns said:
The 1999-2004 GT uses 4.6 SOHC PI heads. The intake ports are square'ish.

The 1996-1998 uses 4.6 SOHC non-PI heads. The intake ports are tear drop shaped.

Since you just had the heads re-worked, you should know which type (PI or non-PI) that you have. Not really possible to put this motor back together correctly without knowing this information.

The new crank timing gear does not appear to be stock. Is it "adjustable"?
Click to expand...
No. It is the one that came with the new kit. The intake ports are square with an injector relief. I looked on the head and couldn't find the PI located on them
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#9
  • Aug 28, 2016
  • #9
Insain1 said:
No. It is the one that came with the new kit. The intake ports are square with an injector relief. I looked on the head and couldn't find the PI located on them
Click to expand...
I was wrong. Here's a picture
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 28, 2016
#10
  • Aug 28, 2016
  • #10
You aren't going to find PI on the casting. Use google and look up the casting numbers that appear on the side of the head. As stated before the non-PI heads will have a tear drop shape. IF square'ish this is a PI head.

The picture looks like non-PI to me.

This really shouldn't be this hard as it should be straight forward. Where did you get the replacement parts from?

Are those the old chains in the picture? They look good.

It's really not that bad to re-use the gear especially if there really isn't any wear.
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 28, 2016
#11
  • Aug 28, 2016
  • #11
wmburns said:
You aren't going to find PI on the casting. Use google and look up the casting numbers that appear on the side of the head. As stated before the non-PI heads will have a tear drop shape. IF square'ish this is a PI head.

The picture looks like non-PI to me.

This really shouldn't be this hard as it should be straight forward. Where did you get the replacement parts from?

Are those the old chains in the picture? They look good.

It's really not that bad to re-use the gear especially if there really isn't any wear.
Click to expand...
Not old ones. That's the new set. The factory crankshaft gear has some wear mainly rub marks from chain.
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Aug 29, 2016
#12
  • Aug 29, 2016
  • #12
Just wondering. Did you time the motor yourself? Are the crank gears the two piece units? Did you position the off set shoulders to the inside as in the attached picture?
 

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Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 29, 2016
#13
  • Aug 29, 2016
  • #13
wmburns said:
Just wondering. Did you time the motor yourself? Are the crank gears the two piece units? Did you position the off set shoulders to the inside as in the attached picture?
Click to expand...
The factory ones are two piece. The aftermarket ones are one piece. I'm going to put the factory crank gears back on
 

Insain1

Member
Dec 7, 2014
34
1
8
Cleburne, Texas
Aug 29, 2016
#14
  • Aug 29, 2016
  • #14
Yes I timed the motor
 
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